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Rule of game

An irregular hexadoku is an irregular sudoku of 16x16.

These problems are solvable by logic and no mathematical reasoning is useful.

Each puzzle consists of 16 rows, 16 columns and 16 regions of various shapes separated by thicker lines.

Each cell contains a letter between A and F or a number between 0 and 9 or is empty.

To solve the problem, you must complete all the empty squares, without using the same value multiple times in the same region, in the same column or in the same row, and, of course, without altering the initial values of the puzzle.